General
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• Very rare
• Very difficult to distinguish low grade chondrosarcoma from chondromatosis (Sarcoma 2003;7:69)

Case reports
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• 38 year old woman with hip pain and difficulty in ambulation (Radiographics 2011;31:1883)
• Chondrosarcoma developing in synovial chondromatosis (J Bone Joint Surg Br 1987;69:137)

Gross description
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• May be more expansile than synovial osteochondromatosis

Gross images
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Various images of extracapsular hip specimen after fixation and bisection

Chondromatosis with chondrosarcoma

Micro description
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• Cartilage cells have cytologic features of malignancy

Micro images
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Tumor tissue permeating cortical bone and filling marrow spaces

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